Honeywell TB3140B/U - Page 15

TB3 SERIES COMMUNICATING THERMOSTATS INSTALLATION INSTRUCTIONS
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End Of Line (EOL) Resistor
The EOL resistor DIP Switch is located in the top right corner of the TB Series thermostat, behind the front plate. The
default is OFF (Left). Turn it to the ONposition (Right)to activate the EOL (120 Ohm) resistor.
Fig. 1 EOL Resistor